Bending tool for small thin copper pipe for mutual inductor accessory

Abstract

The utility model discloses a bending tool of a small thin copper pipe for a mutual inductor accessory, which comprises a limiting mechanism, a bending mechanism, a working table, a bending wrench and a fixed rotating shaft, the limiting mechanism comprises a bending limiting block and an end limiting block, the distance between the two bending limiting blocks is equal to the outer diameter of the copper pipe, the end limiting block is arranged on the table top of the working table, and the bending wrench is arranged on the working table. The bending mechanism is a rotary bending column, the rotary bending column is installed on a fixed rotating shaft, an arc-shaped through hole is machined in the table top of the working table, the rotary bending column is a cylinder and protrudes out of the table top of the working table, a bearing is arranged in the fixed rotating shaft, and the bearing is connected with the rotary bending column. The fixed rotating shaft penetrates through an inner ring of the bearing through a bolt to be fixed to the lower portion of the table top of the workbench, an outer ring of the bearing is fixedly connected with the fixed rotating shaft, and a bending wrench is connected to the side wall of the fixed rotating shaft. The device is simple in structure and convenient to operate, the consistency of the sizes of accessories is guaranteed, and the labor intensity is relieved; meanwhile, the working efficiency is improved, and the production efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of processing tools for transformer accessories, and particularly relates to a bending tool for small and thin copper tubes used for transformer accessories. Background Art

[0002] This kind of small and thin copper tube is used on the sealing cover of the transformer. An air cavity is formed by it and the transformer main body. When in use, air is filled into the air cavity through this copper tube. This small and thin copper tube is similar to an "S" shape. Currently, the conventional manufacturing method is that workers manually bend the straight copper tube into an "S" shape. However, with the improvement of the quality requirements of transformer products by the market and users, manual bending can no longer meet the requirements. It is not only difficult to ensure the consistency of workpieces, but also has low production efficiency. Summary of the Invention

[0003] An improvement aiming at at least one defect of the prior art, the utility model provides a bending tool for small and thin copper tubes used for transformer accessories, which solves the problems that manual bending is difficult to ensure the consistency of workpieces and has low production efficiency.

[0004] The technical solution adopted by the utility model is a bending tool for small and thin copper tubes used for transformer accessories, which includes a limiting mechanism, a bending mechanism, a workbench, a bending wrench and a fixed rotating shaft. The workbench includes a tabletop and four columns fixed at the four ends of the tabletop. The limiting mechanism includes a bending limit block and an end limit block. There are two bending limit blocks, which are installed collinearly on the tabletop of the workbench. The distance between the two bending limit blocks is the outer diameter of the copper tube. The end limit block is installed on the tabletop of the workbench, and its position is perpendicular to that of the bending limit block. The bending mechanism is a rotary bending column. The rotary bending column is installed on the fixed rotating shaft. An arc-shaped through hole is processed on the tabletop of the workbench. The through hole is located on both sides of the bending limit block. The rotary bending column is a cylinder protruding from the tabletop of the workbench and can move in the through hole. A bearing is arranged in the fixed rotating shaft. The fixed rotating shaft is fixed to the lower part of the tabletop of the workbench through a bolt passing through the inner ring of the bearing. The outer ring of the bearing is fixedly connected with the fixed rotating shaft. A bending wrench is connected to the side wall of the fixed rotating shaft. By rotating the bending wrench, the fixed rotating shaft is driven to rotate, so that the rotary bending column on it rotates in the through hole.

[0005] Preferably, the end face of the bending limit block in contact with the copper tube is chamfered into an arc, so that the bent part of the copper tube after bending is arc-shaped.

[0006] Preferably, the end limit block can be adjusted in position along its length direction, so that the length from the bent part to the end after bending the copper tube with one end abutted against the end limit block is exactly the design requirement.

[0007] Preferably, the end limiting block is located outside the through hole, so that the straight copper pipe before bending passes through the through hole, and then when the rotary bending column rotates in the through hole, it contacts the copper pipe and drives the copper pipe to bend.

[0008] Preferably, the rotary bending columns are symmetrically installed on the diameter of the fixed rotating shaft. Before bending, the rotary bending columns are far from the end face of the bending limiting block with an inverted arc, and after bending, they are close to the end face of the bending limiting block with an inverted arc. Both ends of the copper pipe are bent once by the action of the rotary bending columns to form a finished product.

[0009] The beneficial effects of the present utility model are as follows: The structure of the present utility model is simple and the operation is convenient, which ensures the consistency of the sizes of the fittings and reduces the labor intensity through the lever; at the same time, the working efficiency is improved and the production efficiency is high. Description of the Drawings

[0010] Figure 1 It is a front view structure diagram of the bending tool.

[0011] Figure 2 It is a rear view structure diagram of the bending tool.

[0012] Figure 3 It is a top view of the bending tool.

[0013] Figure 4 It is a side view of the bending tool.

[0014] Figure 5 It is a schematic diagram of the copper pipe before bending.

[0015] Figure 6 It is a schematic diagram of the copper pipe after bending.

[0016] Markings in the figure: 1 - bending limiting block, 2 - end limiting block, 3 - workbench, 4 - bending wrench, 5 - rotary bending column, 6 - fixed rotating shaft, 7 - copper pipe, 301 - through hole. Detailed Embodiment

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] As Figures 1 to 4As shown in the figure, a bending tool for a small and thin copper tube used in a current transformer fitting includes a limiting mechanism, a bending mechanism, a workbench 3, a bending wrench 4, and a fixed rotating shaft 6. The workbench 3 includes a tabletop and four columns fixed at the four ends of the tabletop. The limiting mechanism includes a bending limiting block 1 and an end limiting block 2. There are two bending limiting blocks 1, which are installed on the tabletop of the workbench at a certain interval along the same straight line. The distance between the two bending limiting blocks 1 is the outer diameter of the copper tube 7. The bending limiting block 1 is chamfered at the end face (the bending part of the copper tube 7) in contact with the copper tube 7, and the radian is the same as the designed bending radian of the copper tube 7, so that the bending part of the copper tube 7 after bending is the arc of the designed requirement. The end limiting block 2 is installed on the tabletop of the workbench, perpendicular to the bending limiting block 1. The end limiting block 2 is located outside the through hole 301, so that the straight copper tube before bending passes through the through hole 301, and then when the rotating bending column 5 rotates in the through hole 301, it contacts the copper tube 7 and drives the copper tube 7 to bend. The end limiting block 2 is processed with a long hole, and is connected to the workbench 3 by screwing 2 screws through the long hole. The end limiting block 2 can be adjusted in position along its length direction, so that the length from the bending part to the end after bending the copper tube 7 against the end limiting block 2 is exactly the designed requirement. The bending mechanism is a rotating bending column 5. The rotating bending column 5 is installed on the fixed rotating shaft 6. An arc-shaped through hole 301 is processed on the tabletop of the workbench 3. The through hole 301 is located on both sides of the bending limiting block 1. The rotating bending column 5 is a cylinder protruding from the tabletop of the workbench 3 and can move in the through hole 301. The rotating bending column 5 is symmetrically installed on the diameter of the fixed rotating shaft 6. Before bending, the rotating bending column 5 is far from the chamfered end face of the bending limiting block, that is Figure 5 position, and after bending, it is close to the chamfered end face of the bending limiting block, that is Figure 6 position. A bearing is arranged inside the fixed rotating shaft 6. The fixed rotating shaft 6 is fixed to the lower part of the tabletop of the workbench 3 by bolts passing through the inner ring of the bearing. The outer ring of the bearing is fixedly connected to the fixed rotating shaft 6. A bending wrench 4 is connected to the side wall of the fixed rotating shaft 6. By rotating the bending wrench 4, the fixed rotating shaft 6 is driven to rotate, so that the rotating bending column 5 on it rotates in the through hole 301.

[0019] When bending, as Figure 5 and Figure 6 shown, first, adjust the position of the end limiting block 2 according to the designed requirement of the length of the copper tube 7 and fix it by screwing. Then, rotate the rotating bending column 5 to the initial position. Then, place the copper tube 7 into the gap between the two bending limiting blocks 1 and keep the end of the copper tube 7 against the end limiting block 2. Then, rotate the bending wrench 4 to drive the rotation of the fixed rotating shaft 6, and then drive the rotating bending column 5 from Figure 5 position to Figure 6 position. The rotating bending column 5 drives the copper tube 7 to bend according to the designed shape.

[0020] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A bending tool for small copper tubes for transformer accessories, characterized in that: It includes a limiting mechanism, a bending mechanism, a workbench, a bending wrench and a fixed rotating shaft. The workbench includes a table and four columns fixed at the four ends of the table. The limiting mechanism includes a bending limiting block and an end limiting block. There are two bending limiting blocks, which are colinearly installed on the table of the workbench. The distance between the two bending limiting blocks is the outer diameter of the copper tube. The end limiting block is installed on the table of the workbench and is perpendicular to the bending limiting block. The bending mechanism is a rotating bending column, which is installed on the fixed rotating shaft. An arc-shaped through hole is processed on the table top of the workbench, and the through holes are located on both sides of the bending limit block. The rotating bending column is a cylinder protruding from the table top of the workbench and can move in the through hole. A bearing is arranged in the fixed rotating shaft, and the fixed rotating shaft is fixed to the lower part of the table top of the workbench by bolts passing through the inner ring of the bearing. The outer ring of the bearing is fixedly connected to the fixed rotating shaft, and a bending wrench is connected to the side wall of the fixed rotating shaft. The fixed rotating shaft is driven to rotate by rotating the bending wrench so that the rotating bending column thereon rotates in the through hole.

2. The bending tool for a small copper tube for a transformer accessory according to claim 1, characterized in that: The end surface of the bending limit block in contact with the copper tube is rounded.

3. The bending tool for a small copper tube for a transformer accessory according to claim 1, characterized in that: The end stop block can be adjusted in position along its length direction, so that after one end of the copper tube is bent against the end stop block, the length from the bending point to the end is just the design requirement.

4. The bending tool for a small copper tube for a transformer accessory according to claim 1, characterized in that: The end limit block is located outside the through hole.

5. The bending tool for a small copper tube for a transformer accessory according to claim 2, characterized in that: The rotary bending column is symmetrically mounted on the diameter of the fixed rotating shaft. Before bending, the rotary bending column is far away from the end face of the inverted arc of the bending limit block, and after bending, it is close to the end face of the inverted arc of the bending limit block.

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